Fig. 2. Twist expression in Su(H) loss- and gain-of-function embryos. (A,C) Stage 10 whole-mount embryos stained with anti-Twist. (B,D) Corresponding close-ups of embryos in A,C. (A,B) Su(H)^null mutant, like wild type, modulates Twist into low and high domains. (C,D) UAS-Su(H)-VP16 embryo ectopically expresses high Twist levels. Black arrowhead points to cells, located in what should be the low Twist domain, that express high amounts of Twist compared to wild type.